Sylwester Swiatkiewicz

National Research Institute of Animal Production | PIB · Department of Animal Nutrition and Feed Science

A total of 256 male Ross 308 chickens were assigned to four treatments in a 2 × 2 factorial design with two levels of the anticoccidial vaccine (ACV) Livacox T (none or 1 × dose) with or without dietary supplementation with the probiotic Protexin® (P). The growth performance parameters for the test periods (1–21, 22–42, and 1–42 d) and oocyst per g...

The objective of this study was to evaluate whether there are negative effects of the partial replacement of white corn with rye along with xylanase supplementation on overall bone quality, eggshell mineralization, and mechanical strength in laying hens. From the 26th week of life, ISA Brown laying hens were fed either a wheat–corn diet or a diet c...

Black soldier fly larva meal (BSFM) application as an innovative feed material has been developed in aquaculture nutrition. However, recent scientific literature is still lacking in the case of insect meal effects on different stages of salmonid fish, and the vast majority of research is focused on farmed Atlantic salmon. Therefore, the holistic ap...

Black soldier larva meal (BSFM) seems to be a competitive protein and fat source for widely used fish meal (FM) and fish oil. Because of the still present problem of overfished seas and oceans for feed purposes, even a low substitution of the mentioned feed materials could have a positive impact on the environment. Due to the specificity of salmon...

The extent to which lupin seeds can replace soybean meal in diets for broiler chickens is limited, and one of the reasons for this may be a lack of careful consideration given to the age-related amino acid availability differences in the feed formulation process. This study aimed to determine and compare standardised ileal digestibility (SID) coeff...

In the current study the hypothesis that 1.0% dietary inclusion of glutamine (Gln), a conditionally essential amino acid that influences protein synthesis and shows anti-osteoporotic effect, can influence eggshell quality was tested on laying hens in the post-peak laying period. A 30-week-old Bovans Brown hens were randomly assigned to control grou...

There is no information regarding whether changes in the microbiological balance of the gastrointestinal tract as a result of an infection with Clostridium perfringens influence the development of metabolic bone disorders. The experiment was carried out on male broiler chickens divided into two groups: control (n = 10) and experimental (n = 10). Th...

The current study tested the hypothesis that 1.0% dietary inclusion of L-glutamine (Gln), an non-essential amino acid that influences protein synthesis, can improve internal egg quality, including amino acids profile. Thirty-week-old Bovans Brown laying hens in their middle laying period were assigned to one of the two experimental groups (12 repli...

The research was conducted on the effect of bird broilers fed with different hybrid rye doses on the fatty acids profile in muscle. The first experiment was performed on 3 geese broilers groups fed with hybrid rye, oats or hybrid rye and oats mix in proportion 1:1. No effect of the hybrid rye feeding of geese on the SFA level in meat was observed,...

Insect meals are sustainable alternative protein sources in animal nutrition. However, the data in the topic of their application in petfood and ornamental fish nutrition are scarce. Thus the present study was undertaken to asses their usability in guppy (Poecilia reticulata) diets. The first experiment aimed to investigate the attractiveness of se...

The current study investigated the effects of the inclusion of modern hybrid rye (Brasetto variety) to a corn–wheat-based diet, with or without xylanase, on the absorptive surface of the small intestine of broilers. A total of 224 one-day-old male Ross 308 broiler chicks were randomly divided into four experimental groups with seven replicate cages...

The current study aimed to assess the effects of dietary alpha-ketoglutarate (AKG) supplementation to laying hens on the fatty acid (FA) profile and cholesterol levels of the egg yolk at the end of production cycle. The experiment was performed on forty-eight Bovans Brown laying hens randomly assigned to either a control group (CONT) or a group sup...

Sanitary conditions and diet are important elements determining the occurrence of pathogens in animals. The aim of the research was to assess the effect of an experimental diet with rye and xylanase for broiler chickens in cages and in a free-range system on the intestinal microbiome. The study was carried out in two experimental stages, the first...

The aim of the experiment was to assess the effect of dietary alpha-ketoglutarate (AKG) supplementation on performance, serum hormonal indices, duodenum and jejunum histomorphometry, meat quality characteristics, bone quality traits and cartilage degradation in laying hens with a mature skeletal system. Forty-eight 30 week-old Bovans Brown laying h...

This study aimed to determine and compare standardised ileal digestibility (SID) coefficients of amino acids (AA) in raw seeds of the white-(WF) and the coloured-flowered (CF) field pea cultivar as sole sources of AA in the diets fed to broiler chickens aged 14 or 28 days. An additional purpose was to check the influence of exogenous protease added...

The aim of the study was to determine the effect of caponizing on body weight and physicochemical properties of meat of the capons - hybrids obtained from the crossing of hens of the Yellow-Legged Partridge (Ż-33) breed with meat roosters. The study covered 80 roosters - hybrids, which were randomly assigned to two groups of 40 animals each (8 boxe...

The aim of the study was to investigate the effects of dietary enzymes and training on carbohydrate digestibility, blood morphology and biochemistry in horses. A group of 10 animals was divided into two treatments: control (C) and supplemented with enzymes (ES). For 14 days, group C was fed a diet based on 6 kg of hay and 6 kg of whole grains of oa...

In this study, the effect of soybean meal substitution by raw chickpea seeds on the thermal properties and fatty acid profile of subcutaneous fat tissue of broiler chickens was examined. The experiment, performed on Ross 308 chickens, lasted for 42 days. Tight subcutaneous fat tissue was analyzed using differential scanning calorimetry (DSC) measur...

The aim of this study was to evaluate the effect of algal oil with very high level of docosahexaenoic acid (DHA, C 22:6n-3 ) used as fat source in the diet for laying hens, on egg yolk lipids fatty acid composition, as well as egg production and egg quality indices, in comparison with other dietary fat sources. The experiment was carried out on 168...

In the present study, the complete cycle of the preconsumer waste transition by black soldier fly larvae (BSFL) into sustainable raw material (dietary fat) for broiler chickens was examined. In two individual experiments, the effect of selected rearing medium made from various preconsumer wastes on the nutritive value and performance of BSFL were t...

Two independent experiments were performed to evaluate the effect of nisin alone or with monensin on gut microbiota, gut microbial activities, and histomorphology (exp 1) and the effect of nisin application in a dose‒response manner on the growth performance of broiler chickens (exp 2). A total of 900 one-day-old female Ross 308 chicks (400, exp 1;...

1. The influence of the age of broiler chickens on ileal amino acid (AA) digestibilities in three cereals was examined. The digestibility estimates, including both apparent (AID) and standardised (SID) coefficients, for wheat, triticale and barley samples were determined using 14 and 28 d old broilers of mixed sex, fed diets containing the test gra...

This study focused on analyzing the effects of inclusion of modern hybrid rye to corn-wheat diet on mechanical properties of bones and tendons. A total of 224 broiler chickens were fed a diet without rye inclusion or a diet containing 15% of hybrid rye cv. Brasetto. The diets were either unsupplemented or supplemented with xylanase (minimum activit...

• In this study, 240 ISA Brown hens were fed diets containing different levels of hybrid rye, and the influence of xylanase addition on laying performance and egg quality was evaluated. • Birds were allocated to 10 treatment groups with 12 replicates (cages) of two hens and were fed, from week 26 to 50, isocaloric and isonitrogenous experimental di...

The aim of the studies was to evaluate the effect of the diet in the final growth phase and slaughter age of poulards on productivity, dressing percentage, carcass colour and physicochemical properties of meat. The studies were conducted on 78 hybrids obtained by crossing Ross 308 broiler roosters with Rhode Island Red (R-11) dual-purpose laying he...

In this paper, we present a study on the evaluation of the effect of xylanase addition to a diet with an increasing content of modern hybrid rye (Brasetto variety) on the performance indices and viscosity of small intestine content in broiler chickens. A total of 560 1-day-old male Ross 308 chickens were randomly assigned to 1 of 10 treatments, eac...

Simple Summary Today the poultry industry is facing mounting pressure to phase out chemoprophylaxis. One of the major threats to the poultry production is coccidiosis, a widespread parasitic disease, commonly controlled by in-feed coccidiostats. The use of immunoprophylaxis with the live anticoccidial vaccines instead of coccidiostats in broiler ch...

Introduction: The influence of feeding genetically modified MON 810 hybrid maize on the growth and haematological and biochemical indices of rats was tested. Material and Methods: Two conventional (non-GM) and two test (MON 810) lines of maize were used in semi-purified diets at the level of 40% w/w. The non-GM I, MON 810 I, non-GM II, and MON 810...

The aim of this study was to evaluate the effect of full-fat insect meals fed ‘on top’ to broiler chickens on their performance and the microbiota composition in the gastrointestinal tract. A total of 1850 day-old Ross 308 females were used in a set of four independent experiments. The insects Gryllodes sigillatus, Shelfordella lateralis, Gryllus a...

The rise in the Muslim population with the economic disability of Muslim countries have made the term halal common all around the world. The lack of information about halal in non-Muslim countries has made the status of imported halal products uncertain for Muslim countries. Halal meat is the most critical product due to the precise rules and requi...

The trial with 240 caged ISA Brown laying hens was performed to evaluate the effect of selected feed additives on mineral utilisation as well as biomechanical (breaking strength, yielding load, stiffness) and geometrical (cortex thickness, cross section area, weight, length) indices of tibia and femur bones. At 26 wks of age the layers were randoml...

The aim of this study was to investigate how oil obtained via super-critical CO2 extraction from Tenebrio molitor (TM) and Zophobas morio (ZM) larvae affect the growth performance, nutrient digestibility, lipid fatty acid composition of liver and breast tissue, and the expression of selected genes in the liver of broiler chickens. Two independent e...

The aim of the study was to assess the effects of two dietary probiotic preparations on the growth performance and gastrointestinal tract microecology of the Florida softshell turtle (Apalone ferox). In this 52-week experiment, 36 young animals were randomly distributed into three experimental groups: the control (CON) group, which was treated with...

Freshwater turtles are commonly kept in captivity as pets, bred in zoos for conservation programs, and commercially farmed for pet markets and human consumption, but their nutrition can be challenging. However, based on practical experience, two main strategies may be identified: the use of non-calculated raw diets and the use of balanced commercia...

The aim of the study was to determine the effect of genotype (breed/line) and spaying of pullets on body weight, estradiol level, carcass and meat quality. Subjects were Rhode Island Red (R-11), Yellowleg Partridge (Ż-33) and Sussex hens (S-66), 100 birds per line, which were divided into 2 groups, each having 50 pullets and 50 poulards. Spaying wa...

The aim of this study was to investigate the effect of dietary supplementation with nisin alone or in combination with salinomycin or monensin on broiler chickens in terms of growth performance, selected blood parameters, digestive enzyme activity, apparent nutrient digestibility, and tibiotarsus mineralization, as well as selected gastrointestinal...

Foot pad dermatitis (FPD), a condition of inflammation and necrotic lesions on the plantar surface of the footpads, is commonly observed in fast-growing broiler chickens and turkeys. FPD negatively affects the welfare of birds, performance indices and the economic profit of poultry meat production. Nutrition is an important factor affecting water i...

Recently, there has been a noticeable growth in interest in the potential of edible mushrooms and their application in prevention and therapy. The numerous health-promoting properties of edible mushrooms include: antioxidant, immunostimulatory, anti-inflammatory, antibacterial, antiviral and hypocholesterolemic properties. Considering such a broad...

The aim of the experiment with 240 ISA Brown hens fed the diets with standard or decreased Ca level was to evaluate the effect of selected feed additives on laying performance and eggshell quality. The hens were allocated to 10 treatments, each containing 12 cages (replicates) of 2 birds. A 2 x 5 experimental arrangement was used. From 26-70 wks of...

The experiment was designed as a 2 × 2 × 2 factorial arrangement with 6 replicate pens per treatment (8 male Ross 308 chicks per pen) conducted from 1 to 42 d of age to evaluate the effect of dietary crude protein level (CP) and herbal extract blend on performance indices, results of slaughter analysis, and oocyst shedding in broilers vaccinated ag...

The aim of the study was the comparison of the physicochemical and sensory characteristics of capons and cockerels. The experiment involved 80 Rhode Island Red (R-11) cockerels, which were randomly assigned to two groups with 40 birds per group. Group I (control) consisted of uncastrated cockerels, and group II was comprised of birds subjected to c...

A high content of non-starch polysaccharides (NSP), namely arabinoxylans (AX), in rye is a reason for the potential adverse effect of this grain on intestinal functions, gut microflora, absorption of nutrients and performance indices. As such, the use of rye grain in intensively producing poultry diets is limited. However, recently developed new ty...

Broiler chicken welfare, health and performance are strictly linked with skeleton development. Lameness compromises welfare of broiler chickens and causes considerable economic loss since lame birds have difficulty accessing feed and water, become dehydrated and eventually die. Leg disorders are therefore considered to be one of the main factors as...

Ingluvies is present predominantly in omnivorous and herbivorous avian species. The crop constitutes an enlargement of the esophagus, of which the shape is species-specific. The role of the crop is mostly limited to a storage and moistening function. However, its presence has an important influence on limiting contamination by potentially pathogeni...

The aim of present study was to evaluate the potential synergistic effect of salinomycin and nisin on gastrointestinal tract microbial ecology and activity as well as the influence of nisin on broiler chicken growth performance. In the first experiment, which lasted 35 days, such dietary additions as: NA – no additives, SAL – salinomycin (60 mg · k...

Vitamin D plays many important functions in the animal, as it is necessary for proper calcium (Ca) absorption and use in different biological processes. The aim of several recent experiments with poultry was to evaluate the efficacy of different forms and levels of vitamin D3 in the diets for broiler chickens and laying hens. The results of these s...

Ingluvies is present predominantly in omnivorous and herbivorous avian species. The crop constitutes an enlargement of the esophagus, of which the shape is species-specific. The role of the crop is mostly limited to a storage and moistening function. However, its presence has an important influence on limiting contamination by potentially pathogeni...

Cottonseed meal (CSM) is a by-product of the oil industry, i.e. oil extraction from cotton seeds. It is a rich source of protein (30 to 50% dry matter), characterised by a high concentration of amino acids. However, a relatively low concentration of lysine restricts the quality of protein in CSM. Its use as a feed material in poultry nutrition is l...

The aim of the present study was to examine how different dietary fat types affect performance, microbiota composition in gastrointestinal tract digesta as well as ileum histomorphology of broiler chickens challenged with virulent Clostridium perfringens strains. Birds were fed on diets containing either soybean oil (SO), palm kernel fatty acids di...

The aim of this review is to present and discuss the anatomy and physiology of crop in different avian species. The avian crop (ingluvies) present in most omnivorous and herbivorous bird’s species, plays a major role in feed storage and moistening, as well as functional barrier for pathogens through decreasing pH value by microbial fermentation. Mo...

Probiotics are widely used in nutrition, and their mode of action is intensively studied in mammals and birds; however, it is almost unknown in reptiles. In the present study, Trachemys scripta scripta and Sternotherus odoratus were used to assess the effects of dietary probiotics on chelonian gastrointestinal tract microecology. In the first, 20-w...

The aim of this review is to discuss the use of microalgae as a feed ingredient in poultry nutrition. Microalgae are unicellular, photosynthetic aquatic plants. They are introduced to poultry diets mainly as a rich source of n-3 long chain polyunsaturated fatty acids, including docohexaenoic and eicosapentaenoic acid, but they can also serve as a p...

The consumption of poultry meat and eggs is expected to increase considerably in the nearest future, which creates the demand for new poultry feed ingredients in order to support sustainable intensive production. Moreover, the constant improvement of the genetic potential of poultry has resulted in an increased nutrient density in poultry feeds, wh...